You can color a grayscale tiff in Illustrator by simply selecting it then selecting a color you want.
I would think if these are two spot colors and you really want two different oranges you would want to clip the building either in
Photoshop or Illustrator and place it on top of one another.
I would normally say do a duo tone but that would mix the two colors.
So this is how i would go about it in Illustrator
1. Import the image as a grayscale tiff or import it and convert it to a grayscale by going to Edit>Edit Colors>Convert to Grayscale
2. then select the background color.
3. then copy the image and paste in front Command C and then Command F and select the darker orange color
4. with the pen tool create an a path that is the shape of the building exactly. Make sure it is a closed path.
5. then select the path and the top image the one you paste in front.
6. then go to Object>Clipping Path>Make
7 I would then group the two
with this method you have to good with the pen tool, but that is true of Illustrator in general.
now with the CMYK image it is allowing you to place it but is simply warning you of the conversion taking place.
What you should do is select in your Photoshop and Illustrator color settings to sRGB since this is probably the space you want.
and convert the CMYK into a RGB file which is what you should have done in the first place.
So open it i Photoshop convert to sRGB and replace it in Illustrator.
All should be fine.
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What are you talking about exactly? Do you need to design a web page or a print document? For a web page, RGB is way to go. You do not need to worry about "web-safe" color - we live in a age of true color monitors/ screens even on mobile phones, so any color you use should be displayed correctly. just remeber to check your pixel preview from time to time to avoid unpleasent surprises wit hantialaising or placment of obkjects once you export stuff from AI... For the rest, follow Wade's tips.
I am doing a web page. Are you saying I don't have to check only web colors in the color picker?
That is correct.